Any help appreciated

[Whimptiessir]

I have 3 Dell s2340l monitors plugged in my Dell 3100 DisplayLink docking station. As the docking station comes with 1 display port + 2 hdmi ports, two of the monitors are connected via hdmi while the third one is connected via a display port to hdmi cable (Dell s2340l monitors are not equipped with a display port). Whichever monitor is connected to whichever hdmi port on the dock works fine. Whichever monitor is connected to the display port is not properly detected however and shows as "generic pnp monitor" in the device manager with resolution stuck at 640x480. Amongst other things, I've tried to install the latest displaylink driver with no success. I'm running windows 10 Home, version 21H2, build 19044.1682. Any help appreciated, taxing issue!

Thanks,

Joe.

[rboerner]

Originally Posted by Whimptiessir

I have 3 Dell s2340l monitors plugged in my Dell 3100 DisplayLink docking station. As the docking station comes with 1 display port + 2 hdmi ports, two of the monitors are connected via hdmi while the third one is connected via a display port to hdmi cable (Dell s2340l monitors are not equipped with a display port). Whichever monitor is connected to whichever hdmi port on the dock works fine. Whichever monitor is connected to the display port is not properly detected however and shows as "generic pnp monitor" in the device manager with resolution stuck at 640x480. Amongst other things, I've tried to install the latest displaylink driver with no success. I'm running windows 10 Home, version 21H2, build 19044.1682. Any help appreciated, taxing issue!

Thanks,

Joe.

I suspect (but cannot be sure) that the DisplayPort (DP) to HDMI cable you are using is contributing to the unexpected behavior.

In brief, there are two types of DisplayPort to HDMI cables. 'Active' DP to HDMI cables have a protocol converter chip inside of them that convert the video protocol from one standard to another. 'Passive' DP to HDMI cables do not have a protocol converter, and only serve to adapt between the two different physical connection types.

The type of cable required depends on the capabilities of the host device's DisplayPort video output port. 'Pure' DisplayPort video outputs require an Active cable in order to convert to a different standard. 'Dual Mode' also known as 'DP++' DisplayPort outputs have a protocol converter built-in, and as a result only require Passive cables.

Dell's documentation for the D3100 is unclear as to what type of DisplayPort output is in use. If the documentation is taken literally based on the illustrations, the DisplayPort output is a 'pure' output that requires an Active cable.

I would suggest replacing the current DP to HDMI cable with a different one that is confirmed to be the 'Active' type to see if the behavior changes.